All the major media companies, driven largely by their Hollywood film and television businesses, have made larger contributions to President Obama than to his rival, former Gov. Mitt Romney, according to the Center for Responsive Politics, a nonprofit, nonpartisan Washington-based research group that publishes the Open Secrets Web site.

Even companies whose news outlets are often perceived as having a conservative bias have given significantly more money to Mr. Obama. Rupert Murdoch’s News Corporation, for example, has contributed $58,825 to Mr. Obama’s campaign, compared with $2,750 to Mr. Romney.

Other media companies have contributed more significantly to Mr. Obama, including Time Warner, owner of CNN and the magazine publishing house Time Inc. The company, which is based in New York and also owns Warner Brothers and HBO, has contributed $191,834 to Mr. Obama in the 2012 election cycle, compared with $10,750 to Mr. Romney. The Walt Disney Company, owner of ABC and ESPN, donated $125,856 to Mr. Obama and $9,950 to Mr. Romney.

Philadelphia-based Comcast Corporation, owner of NBCUniversal and one of the biggest spenders in lobbying money in Washington, has given $206,056 to Mr. Obama and $20,500 to Mr. Romney.